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The ambipolar electrostatic potential rising along the magnetic field linefrom the grounded wall to the centre in the linear gas dynamic trap, rules theavailable suppression of axial heat and particle losses. In this paper, thevisible range optical diagnostic is described using the Doppler shift of plasmaemission lines for measurements of this accelerating potential drop. We usedthe room temperature hydrogen jet puffed directly on the line of sight as thecharge exchange target for plasma ions moving in the expanding flux from themirror towards the wall. Both bulk plasma protons and $He^{2+}$ ions velocitydistribution functions can be spectroscopically studied; the latter populationis produced via the neutral He tracer puff into the central cell plasma. Thisway, potential in the centre and in the mirror area can be measuredsimultaneously along with the ion temperature. A reasonable accuracy of$4\div8\%$ was achieved in observations with the frame rate of $\approx 1~kHz$.Active acquisitions on the gas jet also provide the spatial resolution betterthan 5~mm in the middle plane radial coordinate because of the strongcompression of the object size when projected to the centre along the magneticflux surface. The charge exchange radiation diagnostic operates with threeemission lines: H-$\alpha$ 656.3~nm, He-I 667.8~nm and He-I 587.6~nm. Recordedspectra are shown in the paper and examples for physical dependences arepresented. The considered experimental technique can be scaled to the upgradedmulti-point diagnostic for the next generation linear traps and other magneticconfinement systems.

Charge exchange radiation diagnostic with gas jet target for measurement of plasma flow velocity in the linear magnetic trap